Sandpapering and polishing machine.



A. GUSTAFSON, R. ENSZLIN & J. M. REYNOLDS.

SANDPAPERING AND POLISHING MACHINE.

APPLICATION FILED MAY 6. 1908.

Patented Feb. 15, 1910.

2 SHEETS-SHEET 1.

IN V ENTORS ATTORNEY kw R mg Q A NN WITNESSES: flg w 1414 v m. 8 km A. GUSTAPSON, R. ENSZLIN & J. M. REYNOLDS.

SANDPAPBRING AND POLISHING MACHINE. APPLICATION IILED MAYG, 1908.

94:9, 1 8 1 Patented Feb. 15, 1910.

2 SHEETS-SHEET 2.

WITNESSES.- INVENTORS 4% A/IK' By 5.

A TTOR NE Y.

UNITED sTAtrns PATENT OFFICE.

ALFRED GUSTAFSON, RUDOLF ENSZLIN, AND JOHN M. REYNOLDS, OF SAN FRANCISCO,

' CALIFORNIA.

SANDPAPERING AND POLISHING MACHINE.

Specification of Letters Patent.

Patented Feb. 15, 1910.

Application filed May s, 1908. Serial No. 431,237.

citizens of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented new and useful Improvements in Sandpapering and Polishing Machines, of which the followin is a specification.

The ol ject of the present invention is to provide a machine for polishing or surfacing floors, especially wooden floors, by means of sand paper or similar polishing material, which machine will be convenient and rapid in operation.

In the-accompanying drawing, Figure 1 is a. side view of the machine; Fig. 2 is a plan view; Fig. 3 is a rear View.

Referring to the drawing, the machine comprises a carriage, the frame of which is formed of upper and lower side bars 1, 2, connected at their ends, and also braced by angular bars 3. The rear ends of the lower bars 2, are bent upward and extended, as

shown at at, to form handle bars, which bars 4 are connected to the upper bars 1 by diagonal braces 5. The above named bars are connected across the machine by channel irons 6, by a cross bar 7 across the lower portion of the handle bars, and by a plate 8, which provides a bearin for a ressure rod 9 as hereinafter descrlbed. aid frame travels on a rear central wheel 10, on a shaft 11 having hearings in hanger bars 12 depending rom the handle bars .4, also upon two wheels 13 on a shaft 14 having bearin s at the center of the lower portion of tie frame.

Upon the top of the carriage, immediately above the channel irons 6, are secured supports 15 for an electric motor 16, to which current is supplied'from any suitable'source by a flexible cord 17. U on the shaft of this motor is secured a sproc et wheel 18, around which passes a sprocket chain 19 which'also passes around a sprocket wheel 20 upon a shaft 21 rotating in bearings 22 secured upon the underside of a forward or projecting portion 23 of the frame. A'shaft 24 is also provided at the rear ortion of the frame,

aving bearings in yo es 25, adjustably secured to the lower bars 2 by means of bolts 27 assing through slots 28 in said bars 2. Said yokes can be moved longitudinally by means of screws 29 on which are screwed nuts 30' which bear against brackets 31 through which said screws pass. By screwing said nuts in or out, the distance of the shaft 24 from the shaft 21 can be increased or diminished as may be desired. 'Upon the shafts 21. and 24: are drums 32, secured only at their inner. ends to the shafts, their outer ends beingfree, disconnected, and unobstructed of. access, Around said drums passes an endless belt 33 of sand paper or other polishing material. As the motor rotates, the lower part of the belt of sand paper moves forward in the direction shown by the arrow.

In order to furnish the necessary pressure of the sand )aper against the floor which is to be smoothed or polished, there are provided on the under side of the lower bars 2 bearings 34 for a rock shaft 35 carrying a crank arm 36 connected at its free end to a rod 39 which passes at itsupper end through the plate 8 and has screwed thereon a nut 38 having a hand wheel 39. A coiled spring 40 is interposed between said plate 8 and a nut 41 screwed on said rod, and presses the nut downward. From said rock shaft 35 extends an arm 42 pivoted at its forward end to a block 43 which bears down upon the endless belt of sand paper, with a pressure derived from the pressure of the coiled spring 40 against the nut -11. However, by screwing the adjusting wheel 39 said block can he raised to remove said pressure, thus permitting the apparatus to be freely wheeled over the floor to any part. where it is desired to use it.

An important feature of this invention is the arrangement whereby the belts of smoothing or polishing material can be removed from the drums and replaced by others when desired. This can be done very quickly with the present machine, by reason of the fact that said drums are entirely free and unobstructed at. one end, and said drums are supported wholly on one side of the A further novel feature of the invention 7 is believed to he the arrangement of the adjusting'wheel 39 closcto the'ha'ndle e15, which enables'the pressure to be easily and quickly varied, if desired.

We claim 1. In an apparatus of the character described, the combination of a carriage havmg a front axle and a pair of wheels thereon, and a rear axle and a single wheel therer on, a motor mounted on said carriage immediately above the front axle, transyerse shafts rotatably supported on said carriage,

respectively in front ofand behind said on, and a rear axle and a single wheel thereon, amotor mounted on said carriage immediately above the front axle, transverse shafts rotatably supported on said carriage, respectively in front of and behind said axle, said shafts extending outward beyond their bearings, drums secured upon said outwardly extending ends adapted to support. an endless belt and having their outer ends free and unobstructed to pass within said belt, means for rotating said drums from said motor, and means for independently adjusting to and from one of said drum shafts the bearings for the other drum shaft, substantially as described.

3. In an apparatus of the character described, the combination of a carriage, a handlebar extendingrearwardly and upwardlytherefrom, a motor mounted upon said carriage, drums rotatably supported by said carriage, and adapted to carry an endless belt of suitable polishing material, means for depressing said belt, a connection from said means to'a point adjacent to the upper end of the handle bar, and means located near said upper end for adjusting said means to Vary said pressure, substantially as described.

In testimony whereof we have hereunto set our hands in the presence of two subscribing witnesses.

ALFRED GUSTAFSON. RUDOLF ENSZLIN. JOHN M. REYNOLDS.

Witnesses:

F, M. W RIGHT, D. B RICHARDS. 

